Enhancing the Performance of a Wind-Driven Grid-Connected Induction Generator

Abstract

Objectives: optimizing the performance of wind-driven grid-connected cage induction generators for constant torque, constant mechanical power and constant wind speed conditions. The optimization aimed to maximize the power factor, minimize the total losses, minimize the input reactive power, minimize the output current or maximize the efficiency. Methodology: Closed form formulas for the optimizing slips based on a circuit model having linear parameters have been derived for constant driving torque and constant input mechanical power conditions. Optimizing slips have been derived for many performance indices. Also, computer-implemented algorithms, which scan the performance characteristics of the generator, and determine the optimizing slips, have been developed for the constant torque, constant mechanical power and constant wind-speed conditions. With the aid of these algorithms, the electromagnetic saturation effects have been considered. Closed loop system utilizing micro-controller has been suggested for automatic optimization of the induction generator. Experimental tests have been carried out on a laboratory setup, and the computed results have been compared with the measured ones. Findings: The computed results when compared to the experimental measurements confirm the feasibility of the presented optimization theoretical techniques and the derived formulas. The experimental work assured that the proposed optimization technique is easy to be achieved through simply variation of the applied terminal voltage. Application/Improvements: The presented technique has improved the performance of the induction generator. Thus, it could be used to enhance the performance of small and moderate size wind-driven grid-connected constant speed cage induction generator system. The suggested control technique will enrich utilization of wind energy. Keywords: Induction Generator, Performance Optimization, Wind Energy